Fail-Safe Chart
WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
If a problem occurs in the electric power steering system, the P/S warning light will come on in the combination meter and steering power assist will be stopped, fixed at a particular point, or decreased simultaneously to protect the system.
Electronic power steering system
FAIL-SAFE CHART
| DTC No. | Detection Condition | Fail-safe |
|---|---|---|
| C1511/11 | Torque sensor malfunction | Power assist stops |
| C1512/11 | ||
| C1513/11 | ||
| C1514/11 | ||
| C1521/25 | Motor malfunction | |
| C1524/24 | ||
| C1528/12 | Motor rotation angle sensor malfunction | |
| C1531/25 | ECU malfunction | |
| C1532/25 | ||
| C1534/25 | ||
| C1551/25 | IG power source voltage error | |
| C1552/22 | PIG power source voltage error | |
| C1554/23 | Power source relay malfunction | |
| C1555/25 | Motor relay malfunction | |
| C1533/25 | ECU malfunction | Assist force restricted |
| U0073/49 | CAN bus malfunction | Amount of power assist is locked at 140 km/h (87.5 mph) level of power assist |
| U0121/42 | Skid control ECU communication error | |
| U0105/41 | ECM communication error | Power assist stops |
HINT:
The amount of power assist may be decreased to prevent the motor and ECUs from overheating if the steering wheel is continuously turned when the vehicle is either stopped or driven at a low speed, or if the steering wheel is kept at either full lock position for a long time. In such cases, the amount of power assist returns to normal if the steering wheel is not turned for approximately 10 minutes with the engine idling.